In conversion of $2$ -butanone to propanoic acid which reagent is used?

Consider following reactions:

$\mathrm{Ph}-\mathrm{OH}\stackrel{\mathrm{Na}\text{ metal }}{\to }\text{ Gas }\mathrm{A}$

$\mathrm{Ph}-\stackrel{\mathrm{O}}{\stackrel{\left|\right|}{\mathrm{C}}}-\mathrm{OH}\stackrel{{\mathrm{NaHCO}}_{\mathrm{3}}}{\to }\text{Gas} \mathrm{B}$

The sum of molecular masses of gas $\mathrm{A}$ and $\mathrm{B}$ will be equal to:

The product is

For the above sequence of reactions, identify the correct statements.
(a) $\mathrm{A}$ has more $\mathrm{pKa}$ than $\mathrm{D}$.
(b) $\mathrm{B}$ can be prepared by the deamination of m-toluidine.
(c) $\mathrm{A}$ and $\mathrm{D}$ show HVZ reaction.
(d) $\mathrm{A}$ can be prepared from $\mathrm{D}$ by reduction with ${\mathrm{H}}_2, {\mathrm{CuCr}}_2{\mathrm{O}}_4$.

Which is the incorrect statement regarding the above sequence of reactions?

Which is incorrect for the above reaction (ruling out all intermolecular aldol condensation reactions)?

(a)  The final product is 

(b) The process involves dehydration.

(c) ${\mathrm{LiAlH}}_4$ has no effect on the reaction.

(d) The final product on ozonolysis with ${\mathrm{O}}_3, \mathrm{Zn}, {\mathrm{H}}_2\mathrm{O}$ yields a dial compound.

The reaction of $\mathrm{R}-2-\mathrm{hydroxy} \mathrm{propanal}$ with $\mathrm{HCN}$ occurs in basic medium. Among the following statements, which ones are correct?

$\left(\mathrm{a}\right)$ The product formed is chiral and exist as a racemic mixture.

$\left(\mathrm{b}\right)$ Racemisation occurs at ${\mathrm{C}}_1$ of reactant as carbonyl group is a planar group.

$\text{(c) }$Product formed exists as diastereomers.

$\left(\mathrm{d}\right)$ Basic medium increase ionization of $\mathrm{HCN}$ and increases ${\mathrm{CN}}^{-}$ ,i.e., the nucleophile.